Using volumes to store persistent data - exasol/nagios-monitoring GitHub Wiki

If you want to update your nagios-monitoring container and reuse the configuration and saved states you have to use docker volumes. We need to save the following container directories:

Path	Description
/etc/nagios/conf.d	Nagios configuration
/var/lib/nagios	stored states and check results
/var/cache/nagios	current stats and check results
/var/log/nagios	Nagios log file directory
/opt/pnp4nagios/var	pnp4nagios RRD storage (performance results)

The following example shows how these folder can be stored persistently using bind mounts.

nstorage="/var/tmp/nagiosstorage"                                                                       #define where to store the Nagios data
mkdir -p    ${nstorage}/conf ${nstorage}/lib ${nstorage}/cache ${nstorage}/log ${nstorage}/pnp4nagios   #create necessary directories
chmod 777   ${nstorage}/conf ${nstorage}/lib ${nstorage}/cache ${nstorage}/log ${nstorage}/pnp4nagios   #allow full access for the container
chmod 555   ${nstorage}                                                                                 #but restrict write access on storage root

#now create the Nagios container instance using external volumes
docker create -p1443:443 \
    -v ${nstorage}/conf:/etc/nagios/conf.d:rw,z \
    -v ${nstorage}/lib:/var/lib/nagios:rw,z \
    -v ${nstorage}/cache:/var/cache/nagios:rw,z \
    -v ${nstorage}/log:/var/log/nagios:rw,z \
    -v ${nstorage}/pnp4nagios:/opt/pnp4nagios/var:rw,z \
    --name exasol-nagios \
    --hostname exasol-nagios \
    exasol/nagios-monitoring:latest

#start up the Nagios container - and enjoy ;)
docker start exasol-nagios

Instead of bind mounts you can also use docker volumes instead (see https://docs.docker.com/storage/volumes/ for more information).

Hint: you can mount the "/var/lib/nagios" directory in other docker containers to get access to the Nagios socket. This allows additional connectors and tools like Thruk or check_mk to use and manage the Nagios check results.